Lock-nut.



0. A. MENTZER.

LOCK NUT.

APPLICATION FILED D30. 10, 1913.

Patented June 30,1914.

WITNESSES cuLullllA PLANOOIAPI cmJIABIIIMiON. D. c.

UNITE @TATES PATENT @IFI IQQ OLIVER A. MEN'IZER, OF LANCASTER,PENNSYLVANIA, ASSIGNOR 0F ONE-HALF HENRY E. RANSING, 0F LANCASTER,PENNSYLVANIA.

LOCK-NUT.

memos.

To all whom it may concern:

Be it known that I, OLIVER A. MENTZER, a citizen of the United States,residing at Lancaster, in the county of Lancaster and State ofPennsylvania, have invented certain new and useful Improvements in Look-Nuts, of which the following is a specification, reference being hadtherein to the accompanying drawing.

This invention relates to a combined bolt and nut lock of that classused in the assembling of machinery, structural or railway work, and isintended to prevent the accidental loosening of the nut.

The object of the invention is to provide an article of this kind thatshall consist of few parts, be cheap to manufacture, easily applied andremoved, and be adaptable of repeated use.

With these and other objects in view, my invention consists in certainconstruction and combination of parts as will hereinafter be fullydescribed and claimed in the an nexed specification, and illustrated inthe accompanying drawings, which form a part of this application, and inwhich like figures of reference refer to corresponding parts in all ofthe views; but it is fully understood that while I have here describedmy invention as shown, that I do not confine myself to the exact design,as slight changes may be made in the construction and arrangement of theseveral parts without departing from the spirit of the invention.

In the drawings :Figure 1, is a side elevation of a bolt and nut, shownin a locked position. Fig. 2, is a vertical sectional view of the same,taken on the line XX of I ig. 1. Fig. 3, is a plan view of the washer.Fig. 4, is a detail view of the nut and locking washer.

Referring to the drawings, the usual bolt 1, may be used with theexception that it is provided with one or more fiatted sides 2, orkeyways or grooves (not shown). On the bolt 1 after it is placed inposition, is first placed a washer 3, which is provided with a hole 4:,of the correct shape to fit the bolt 1, and prevent the washer 3, fromturning on the same. The outer surface of said washer 3, is also formedwith a series of radial notches or corrugations 11, which act as aratchet for a locking washer 5, which is next placed on the bolt 1, incontact with the washer 3. Said locking washer 5, is pro- Specificationof Letters Patent.

Application filed. December 10, 1913.

Patented June 36, 191%..

Serial No. 805,670.

vided with one or more locking tongues or spring pawls 6, which engagethe corrugation 11, as said locking washer 5, is rotated against thewasher 3. Said washer 5, is further formed with a central orifice 7,which may have three or more sides, and is here shown as a rectangle,and must be large enough to readily pass over the bolt 1. The nut 8, isformed on its rear surface with a central boss 9, of the same shape andsize as the orifice 7 and designed to enter the same and prevent anymovement between the nut 8, and the locking washer 5. In this manner itwill be seen that as the nut 8, is turned down upon the bolt 1, thelocking washer 5, is carried with it, and when it is brought into closeengagement with the washer 3, the tongues 6, engage the corrugations 11,and as the washer 3, is prevented from turning on the bolt 1, it isimpossible for the nut 8, to loosen or back off the bolt 1.

To loosen and remove the nut 8, I have provided on the rear surface ofthe same, in the path of the tongues 6, a tapered notch 12, to receivethe tongues 6, when the same are lifted by pressing on the teats 10 thusdisengaging the tongues 6, from the corrugations 11, and allowing thenut to be loosened.

Having thus described my invention what I claim as new, and desire tosecure by Latters Patent is 1. In a lock-bolt and nut of the classdescribed, the combination with a bolt and nut, of a washernon-rotatable upon said bolt, retaining means consisting of notchesformed on the outer surface of said washer, alocking washer adjacentsaid nut and turning therewith, tongues carried by said locking washerdesigned to engage said retaining means, means for lifting said tonguesout of engagement with said notches, and means provided in the nut toreceive said tongues when so lifted.

2. In a lock bolt and nut of the class described, the combination with abolt and a nut, the bolt provided with one or more flats or grooves, ofa washer provided with a central opening conforming to the shape of saidbolt, and preventing said washer from turning on the bolt, the outersurface of said washer formed with radial notches, alocking washerformed with a central opening, a boss formed on the nut and designed toenter said opening for the purpose of locking the washer and the nut,tongues formed on said locking washer and designed to en gage thenotches on the Washer preventing the loosening of the nut, said nut povided with notches to receive the tongues when the 5 same are raised todisengage the washer.

3. In a bolt and nut look of the class described, the combination With abolt and a nut, of a pair of Washers, one of said wash-.

ers non-rotatable on the bolt, and the other 10 Washer non-rotatablewith respect to the nut,

means carried by said washers whereby they engage each other and areprevented from movement except in a locking direction until released,and means for releasing the same.

In testimony whereof I aifix my signature 15 in presence of twowitnesses.

' OLIVER A. MENTZER.

Witnesses: HENRY E. RANSING, JOHN J. THOMPSON.

Copies of this patent may be obtained for five cents each,byaddr'es'sihg the Commissioner of Patents, Washington, D. G.

